聚合物微球固载N-羟基邻苯二甲酰亚胺催化剂的制备及其催化氧化性能初探

Preparation of Immobilized N-hydroxyphthalimide Catalyst on Polymer Microspheres and Primarily Investigation of Its Catalytic Property in Oxidation Reaction

首先采用悬浮聚合法,制备了甲基丙烯酸缩水甘油酯(GMA)和甲基丙烯酸甲酯(MMA)的交联聚合物微球(GMA/MMA),然后经过几步大分子反应在微球表面合成与固载了N-羟基邻苯二甲酰亚胺(NHPI),形成固载有NHPI的功能微球GMA/MMA-NHPI。采用红外光谱(FT-IR)及扫描电子显微镜(SEM)等方法对功能微球进行了表征。结果表明,以含环氧基团的GMA/MMA为载体,通过大分子反应可实现NHPI的合成与固载。GMA/MMA-NHPI与醋酸钴(Co(OAc)2)构成的共催化体系,在分子氧对环己烷和环己醇的氧化过程中,显示出良好的催化活性。

Using monodispersed micron-sized PS microspheres as template,EDOT as monomer and APS as initiator,the core-shell PS-PEDOT conductive microspheres were synthesized by chemical oxidation polymerization.The morphology and structure of PS-PEDOT were characterized by SEM and TEM.The characteristic of core-shell structure of PS-PEDOT microspheres was emphatically studied by Raman spectra.On the basis,some synthesis conditions such as ultrasonic irradiation,pH value of PS emulsion and monomer ratio were optimized.Results indicated that ultrasonic could improve the morphology of microspheres,and acid condition was propitious for deposition of EDOT on the surface of the PS template.With the decreasing of pH value or increasing of monomer ratio,the deposition of PEDOT on surface of PS microspheres increased.When m（EDOT）/m（PS）changed from 0.60 to 1.25,the average particle size of conductive microspheres changed from 1.76μm to 1.91μm.